Adapted 'keypress' library usage to version > 2.0

Fixes #15
Merge branch 'master' into fha-rbv-context-integration
WIP
Fixes some leftovers from the 'keypress' update

Fixes #15
Merge branch 'master' into fha-rbv-context-integration
Renamed EarthServerGenericClient.Model_DEMWithOverlays to VMANIP.RectangularBoxViewerModel
Integrated new RBV/Model_DemWithOverlays visualization